Skin mapping for early detention of skin cancer at Sandiane Dermatology Checking your skin means taking note of all the spots on your body, from moles to freckles to age spots. Skin cancer can develop anywhere on the skin and is one of the few cancers you can usually see on your skin.We use the term to refer to the mapping of a person's moles using total body photography. We use this sometimes in people who have many moles and have a history of either melanoma or atypical moles. It can allow the patient and physician to follow individual moles over time to see if they are changing.